Merge branch 'release-v55r6' into 'master'

Prepare LHCb v55r6

See merge request !4511

CMakeLists.txt

@@ -11,7 +11,7 @@
 cmake_minimum_required(VERSION 3.15)
 option(CMAKE_EXPORT_COMPILE_COMMANDS "Enable/Disable output of compile_commands.json" ON)
 
-project(LHCb VERSION 55.5
+project(LHCb VERSION 55.6
         LANGUAGES CXX)
 
 # Enable testing with CTest/CDash

ReleaseNotes/v55r6.md

+2024-04-08 LHCb v55r6
+===
+
+This version uses
+Gaudi [v38r1](../../../../Gaudi/-/tags/v38r1),
+Detector [v1r30](../../../../Detector/-/tags/v1r30) and
+LCG [105a](http://lcginfo.cern.ch/release/105a/) with ROOT 6.30.04.
+
+This version is released on the `master` branch.
+Built relative to LHCb [v55r5](/../../tags/v55r5), with the following changes:
+
+### New features ~"new feature"
+
+- ~Configuration ~Monitoring | Support for using TAE events, !4455 (@rmatev)
+
+
+### Fixes ~"bug fix" ~workaround
+
+
+
+### Enhancements ~enhancement
+
+- MatVec invChol check for failure, !4468 (@gunther) [Moore#740]
+
+
+### Code cleanups and changes to tests ~modernisation ~cleanup ~testing
+
+- ~Simulation | DecayLength rename in ParticleParams, !4485 (@avilla)
+
+
+### Documentation ~Documentation
+
+
+### Other
+